I think the issue here is to define both "effective" AND "attack" in a proper way. Considering that nage executes a wrist grab to limit tori's field of movement and succeeds in doing so, he has, according to his motive performed an "effective attack. If we on the other hand stipulate that an "attack" has to be a singular action leading to immediate neutralization of tori by force, nage has clearly failed to do so.